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Iursovrmnur 1N 'conn-B0X., PLANES.

- t sPEcIFIoATroN-'g TO ALL WHOM IT MAY CONCERN:

Be it known that I, ELIsHA W. LnwrsLof the city of Philadelphia, andState ofPennsylvaniahave inventcdiv a new and improved Core-Box Planefor pattern-makers use; and I do hereby declare the following to beafull and exact description of the construction and` operation of thesame, reference being had to the annexed draw.-` ings, and tothe figuresand letters of lreference marked thereon. i

My inventlon consists of an improved instrument for planing out thesemi-cylindrical concavities inwolideriw` core-hoi;es,` whichV aregenerally composed of twohalves, and serve as moulds for preparingcylindrical` sand;`

cores of an infinite variety of shapes; ,these cores being afterwardsused; in connection with sand?` moulds, when any kind of hollowcylindrical castings are to he'produced. The improved planinginstrument` possesses many` important advantages over. the kind` ofplanes heretofore in common.v use for this class of pattern work; itisverf-accurate andexpeditious in its operation, and-`capable of thenicest adjustment for any required diameter of cylinders within theextreme limits of its capacity.` 'Certain peculiar kinds of cylindricahcore-box worin., which cannot "be" accomplished with the commonroundfaced plane,'and` had to` be heretofore workedrout by hand, `areeasily performeddwith this instrument, ashereinafter fully described. i

In order thatmy said invention may be clearly understood, I will nowproceed t describe more` particularly 1 the construction and operationof the same.

On reference to the drawing, making part of this specification, and inwhich `similar letters ofi reference allude to like parts throughout theseveral views- Figurel is a sectional elevation of the improved plane.Figure 2 isa plan, Figure 3, an end view; and Figure 4a transversesection through the line xy, iig. 2.

The casting A forms the stock of the plane, and` is made as light as isconsistent with required stability of its parts; ait has at its rear enda wooden handle, Kthe base of which is ttedf :into` a` recess in` thestock, and" further secured to the latter by the screws, a a# The stockA is, near the middle, providedlwith a vertical sleeve,` i B, whichrests upon an arched support, C, and serves to carry a verticallyadjustable ,s`l1apedpieceD; the soldV p upright stem of D is fitted intothe sleeve, B, Vand its horizontal cylindrical part carries; therotative tool-luthier,` E, the ax-is of which coincides with the `lineof motion of the plane, and is,` ordinarily `so adjustedlvby means of` 1the set-screw; g, as to intersect the linie of ,n the bottom bearingsurface of the s'tck,lA, but it may be set either above or below thislevel for peculiar kinds of work requiring such adjustment. l F is` the`cutting tool, the shank of which is inserted into a transverselyjboredhole in the enlarged head offtheholder, E, in whicli. it s laterallyadjustable for work of variousudiameters, and secured in any requiredposition `hy means; of a set`-sc`rew,` c. i In.

the stockA-is provided a large opening, G, (g.,2,) wide' enough to allowthe largest cutting toolto rotate,within` the same', when set out forthefull capacity of the instrument, and which also .serves tonliberatethe chips. p A. l rotative feed movement is imparted'to the cutting toolin the following manner. Upon; the rear end 0E tli'etool;` f holderE'ris a small worm-wheel, H, 'into 'which gearsa-worm, I. This wormiisfitted uponfa roundpilu, which )las its bearings in two lugs, h h,cast'on` the hack end of sleeve D, and is provided withfa milledlieadie, the:l flatter being so Vplaced in relation to the handle, K,that it can be readily actuatedyhy therextendedfore-inger oi ,i theright-hand while `workingthe plane, without releasing its hold'on 'thehandle, KL Thel plane providhdiil :with an adjustable gauge, J, securedto the left-hand bottom side of the stock, Aphyrneansof` thumb-scream@ pi jf, pas-sing through slotted openings in the stock; this gauge beingmade to bear againstthe sideof; thegpiecew of woodbeing planed,serves-as asuilcientmguideto keep the plane inthe correct lineof`motioupuringgte ,1

tmust "e r entire operation, and, when once setyinsurestheproper'lhlating of the two halvesofl the` `corellloir evident to anyone practised in pattern-making, thatthis instrument will produce` worketffftlie greateseaccuracyg, i which by means` of the heretoforeemployedplanes, with rounded face, could only bedbne with` great caream?. `consumption of time; but it will,further be easilynnderstood thatit is applicable to suehkinds oiilwork` which cannot be done with therounded plane at all, viz, the dressing out of short lengths `ofuariousdametensa and wittli-` i sharp offsets in one piece of wood. Inthe` common rounded plane, the face of thestoek hearsupoxithelsamelsurface of the wood, which is `being operated upon by the cutting tool,and `that partei?` the stockwhichislini advance of the cutting edgeprecludes all possibility-of working into sharpcornersfor f improvedplane the edge of the tool is capable of cutting out sharply offsettedvariations in the diameter of the box, which heretofore could only bedressed out in-a. tedious manner by means of gouges or chisels. Althoughthis improved instrument is mainly designed for the planing out ofcylindrical lcore-boxes,-it is evident that its use may be extended withequal advantage to many kinds of pattern or other Wood-work, as, forinstance, the 'luting of column patterns, and in other similar cases. l

Having thus described the construction and operation of my improvedplane, I desire to be understood that its arrangement in detail may bemodified in various ways without impairing my invention, among whichmodifications I name the following: the lateral adjustment of thecutting tool may be effected by a set-screw placed in line with theshank of thecutter, and so arranged that the turning of thescrew willmove the tool in thedirection for increasing or decreasing the radius ofthe cutting point." The bearings of the Worm-shaft, d, may be soarranged that the worm can be lifted out of the teeth of the worm-Wheel,for setting the cutter back to the proper position for commencing a nextout, without turning it back by means of the worm, I, or the Worm-shaftZ may be provided with a ratchet feed motion, operated in various ways,for producing a regular feed for thc cutting tool, which intermittentmotion can be readily given by means of the handle, K, if the same werehinged to -the stock and had a limited rocking motion, which wouldnaturally `be imparted by the hand at every reversion of the motion ofthe plane, and which movement may by means'oilasuitable connecting linkand ratchet pawl give the feed motion to the Worm spindle. Itherefore donot wish to limit myself to the precise arrangement of detail as shownin the annexed drawing.

But what I claimras my invention, and desire to secure by LettersPatent, is-

In combination with the stock A, the rotative tool-holder E, carrying atransversely adjustable cutter F, to which Ya circular feed motion isgiven by means of the Worm I and worm-wheel H, or in any othcnequivalent manner.' s

ELISHA Wt LEWIS. Witnesses:

JOHN GOEHRING,

CHAs. E. PANcoAs'r,

- TnEODoRE BERGNER.

